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a right angeled isosceles prism ABC is made of glass of r.i 1.352. A thin glass plate of thickness 3mm and r.i 1.5 is cemented in the hypotanuse AC of the prism. A ray of light is incident on one of the equal faces AB. What should be the angle of incidence if the ray is to pass through the thin glass plate undeflected?

a right angeled isosceles prism ABC is made of glass of r.i 1.352. A thin glass plate of thickness 3mm and r.i 1.5 is cemented in the hypotanuse AC of the prism. A ray of light is incident on one of the equal faces AB. What should be the angle of incidence if the ray is to pass through the thin glass plate undeflected?

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1 Answers

harini desiraju
31 Points
10 years ago

it should pass undeflected through the thin glass slab i.e it should be incident normal to the surface.So the angle of refraction is 45o ,as it is an isoceles rt. prism.Applying Snell's law we get 

sini=(1.352)sin45o

sini=1.352/1.414

i=sin-1(1.352/1.414)

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